Gecarcinus quadratus, known as the red land crab,[1]whitespot crab,[1]Halloween crab,[2]moon crab, Halloween moon crab, mouthless crab[2] or harlequin land crab,[2] is a colourful land crab from the familyGecarcinidae.

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G. quadratus is found in mangrove, sand dunes and rainforest along the Pacific coast from Mexico south to Panama.[3][4] Previously it has also been reported from the Pacific coast of northwestern South America,[3] but in 2014 this population was recognized as a separate species, G. nobili.[4]

The carapace of G. quadratus may reach a length of 5 centimetres (2.0 in). It has a pair of largely purple claws, red-orange legs, and an almost entirely black carapace with a pair of yellow, orange or reddish spots behind the eyes, and an additional pair of whitish spots on the central-lower carapace.[2][4]